May be not, what you are looking for : rpmbuild.
I'd guess, you mean a source code package, tar.gz ?
rpmbuild -bb <name>.spec : Will build the rpm package(s)
You have the 12,000 source SRC.RPMS, Fedora 14 here
http://download.fedora.redhat.com/pu.../source/SRPMS/
Package content : A tar.gz or a tar.bz2, a spec file, etc.
And lots of other spec files and / or src.rpms can be found with Google.
..